Append new files

I have an api running that fetches all the file names in the directory and returns me an array inside an array. Currently, I am running it every second to check if a new file is added and if so... embed it to my div. The issue is that I have to empty my html every time and then re-embed the html. Is there a better way to do this? That way I only embed new filenames rather than all again.

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I have a div which contains a list. This list contains multiple drop-down elements. When the drop-down elements towards the bottom of the list are selected, the list expands in size to accommodate for these new elements. However, these elements are also hidden unless the user scrolls down to click on them. The preferred solution would be having the drop-down elements appear above all others on the list. However, attempting to do this through z-indexing and absolute/relative positioning doesn't appear to work no matter what combination I attempt. Is there any fix to this problem that I am missing?

A solution I am considering is using javascript to generate a similar drop-down menu above all the other divs. Unfortunately, I am not sure on how to begin doing this. If anyone has any ideas on how, please let me know.

This website seems to be written by jquery(AJAX). I would like to scrape all pages' tables. When I inspect the 1,2,3,4 page tags, they do not have a specific href link. Besides, clicking on them does not create a clear pattern of get requests, therefore, I find it hard to use Python urllib to send a get request for each page.

As you can see, the height of the first piece is much more than the rest. I want to make the height of all the pieces a fixed value but make the width of the pieces change according to their respective values. So the width will be changing (decreasing from top to bottom) but the height will remain the same.

I am trying to build an angular project .
In my project I want to show a list of books ,I have a SmallBookView Component for a single book and I want to use ngFor to show many other books./
however after every 3 books I need to add a div to separate this books,
In the end it should look like so

I've stated this question in graph theory terms, but that conceptualization isn't necessary.

What I'm trying to do, using Python, is produce a matrix of zeros and ones, where every row has the same number of ones and every column has the same number of ones. The number for rows will not be the same as the number for columns when the number of rows (sending nodes) does not equal the number of columns (receiving nodes) -- which is something I'm allowing.

It makes sense to me to do this in numpy, but there may be other packages (like networkx?) that would help.

Here's the function I'm looking to write with the desired inputs and outputs:

n_pre = 4 # number of nodes available to send a connection
n_post = 4 # number of nodes available to receive a connection
p = 0.5 # proportion of all possible connections that exist
mat = generate_mat(n_pre, n_post, p)
print mat

The output would be, for example:

[[0, 1, 0, 1],
[1, 0, 1, 0],
[1, 1, 0, 0],
[0, 0, 1, 1]]

Notice, every column and every row has two ones in it. Aside from this constraint, the positions of the ones should be random (and vary from call to call of this function).

In graph theory terms, this means every node has an in-degree of 2 and an out-degree of 2 (50% of all possible connections, as specified with p = 0.5).

(I haven't stated what the behavior should be for cases when p * n_pre or p * n_post is not an integer . . . this behavior is undefined. Maybe the function should raise an error.)

Trying to get an algorithm for a Magic The Gathering application (java).
Example:
Attackers: {a, b}
Blockers: {c, d, e}

Output would be as follows:
Combinations:
a -> first creature attacking alone.
ac -> first creature attacks and blocked by creature c.
ad
ae
acd
ade
ace
acde
b -> second creature attacking alone.
bc
bd
....and so on. It would include such possibilities like
ac bde,
ade bc,
a bcde,
...and so forth.
The attacker can be blocked by multiple blockers.
Thanks for your time. Cheers.

(I know there is easier way to convert to binary but I had started when this by the time I found out that. So I am just gonna try to finish this. I coded this just to learn) :)
I am trying to create a function that converts binary to ASCII code. Here is how I am converting from binary to number:

I would like to know if there are ways to simplify the for loop, such as a lambda expression without changing the nature of the code below. If possible, I would also like to know if there are other ways(better) to execute a series of functions that could do something similarly like the code below.
Thank you